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Underground interlayer type coal in-situ gasification mining system and construction method thereof

A coal, in-situ technology, applied in coal gasification, underground mining, mining fluids, etc., can solve the problems of poor gas tightness, unclear understanding of gasification chamber evolution law and main controlling factors, uneven heating of coal seams, etc. Enterprise economic benefits, realizing the value of coal resources, and the effect of maximizing economic benefits

Active Publication Date: 2021-03-12
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0007]The temperature, pressure and shape of the gasification chamber lack effective monitoring methods, resulting in unclear understanding of the evolution law of the gasification chamber and the main control factors, and the principle of gasification control is still unclear. Unclear, the gasification operation control process cannot guarantee the stable production and gasification efficiency of medium calorific value coal gas, which greatly restricts the gas application of UCG coal gas and the product development of chemical raw material gas
[0008] In summary, UCG technology still has defects such as large energy consumption, uneven heating of coal seams, and poor air-tightness. Stable and controllable progress hinders the green and efficient mining of coal and the large-scale industrial application of UCG technology

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  • Underground interlayer type coal in-situ gasification mining system and construction method thereof
  • Underground interlayer type coal in-situ gasification mining system and construction method thereof

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Embodiment Construction

[0043] The invention is an underground interlayer type coal in-situ gasification mining system and its construction method. Under the background of the huge development potential of my country's underground coal gasification resources, the current UCG technology needs to focus on the direction to be overcome, and the western coal resources are green Guided by the advanced concept of mining, an attempt was made to propose an Underground Coal Interlayer In-situ Gasification System (UCIGS) and its construction method. The basic working principle of UCIGS is as follows: figure 1 As shown, a combustion device is installed at a certain depth in the rock layer below the coal seam floor (the underlying slate layer) to heat the underlying slate layer of the coal seam, and transfer heat to the coal seam through the underlying slate layer by utilizing the thermal conductivity of the underlying slate layer To gasify the coal seam to achieve the effect of interlayer heating, it should be no...

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Abstract

The invention belongs to the technical field of underground coal gasification, and particularly relates to an underground interlayer type coal in-situ gasification mining system and a construction method thereof. According to the gasification mining system and construction method thereof, a pre-control system is used for injecting a flame retardant to moisten coal, and the structure of a gasification system is controlled in advance; a heating vertical shaft is drilled into a coal seam lower base plate rock stratum, combustion equipment is arranged to heat the lower base plate rock stratum, coal is combusted to generate coal gas through the thermal conductivity of the lower base plate rock stratum, and then a gas collecting system collects the coal gas and conveys the coal gas to the ground; in the coal bed gasification process, the coal bed temperature and the lower base plate rock stratum stress are monitored; heating equipment is arranged in the coal seam lower base plate rock stratum, and disturbance to the coal seam is reduced; and the high-temperature-resistant coal wall is reserved by utilizing a pre-control system, so that the air tightness of a gasification cavity is improved, the coal seam is heated more uniformly and controllably, an ideal temperature field is provided for sufficient combustion of the coal seam, and the quality of produced coal gas is improved.

Description

technical field [0001] The invention belongs to the technical field of underground coal gasification, and in particular relates to an underground interlayer type coal in-situ gasification mining system and a construction method thereof. Background technique [0002] The traditional underground coal gasification technology is a process of controlled combustion of underground coal to generate combustible gas through thermal and chemical effects on coal. It integrates the three major processes of well construction, coal mining and gasification, changes traditional physical coal mining into chemical coal mining, and changes traditional mechanized coal mining into unmanned gas extraction. It has the advantages of short mining flow, low cost, and low pollution The advantages of low emission and high resource recovery rate can improve the utilization value of coal, promote the mining of difficult-to-mining coal seams and low-grade coal seams, and drive the development of traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/295E21B43/24E21B43/243
CPCE21B43/295E21B43/24E21B43/243
Inventor 顾霖骏申艳军王双明袁江强白志鹏郝建帅彭程
Owner XIAN UNIV OF SCI & TECH
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